Abstract
The origins of a “pass-through” gut in early bilaterians facilitated the exploration of new habitats, motivated the innovation of feeding styles and behaviors, and helped drive the evolution of more complex organisms. The gastrointestinal tract has evolved to consist of a series of interwoven exchanges between nutrients, host immunity, and an often microbe-rich environmental interface. Not surprisingly, animals have expanded their immune repertoires to include soluble effectors that can be secreted into luminal spaces, e.g., in the gut, facilitating interactions with microbes in ways that influence their settlement dynamics, virulence, and their interaction with other microbes. The immunoglobulin (Ig) domain, which is also found in some non-immune molecules, is recognized as one of the most versatile recognition domains lying at the interface of innate and adaptive immunity; among vertebrates, secreted Igs are known to play crucial roles in the management of gut microbial communities. In this mini-review, we will focus on secreted immune effectors possessing Ig-like domains in invertebrates, such as the fibrinogen-related effector proteins first described in the gastropod Biomphalaria glabrata, the Down syndrome cellular adhesion molecule first described in the arthropod, Drosophila melanogaster, and the variable region-containing chitin-binding proteins of the protochordates. We will highlight our current understanding of their function and their potential role, if not yet recognized, in the establishment and maintenance of host-microbial interfaces and argue that these Igs are likely also essential to microbiome management.
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We thank the anonymous reviewers for valuable feedback that helped improve an earlier version of the manuscript.
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This work was supported in part by grants from the National Science Foundation (IOS1456301 and MCB1817308) to LJD.
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AL and LJD conceived the review and drafted the first full version of the manuscript. ON and CGFA contributed ideas, edited, and revised later versions of the manuscript. All authors contributed to improving the manuscript and have approved the submitted version.
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Liberti, A., Natarajan, O., Atkinson, C.G.F. et al. Secreted immunoglobulin domain effector molecules of invertebrates and management of gut microbial ecology. Immunogenetics 74, 99–109 (2022). https://doi.org/10.1007/s00251-021-01237-2
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DOI: https://doi.org/10.1007/s00251-021-01237-2